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# Why do ping pong balls expand in hot water?

Updated: 10/20/2022

Wiki User

12y ago

Best Answer

Because heat makes plastic expand in hot water.

Wiki User

12y ago
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### How many balls are in 1 gross of ping pong balls?

about 144 ping pong balls are in a gross.

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The heat from the boiling water warms up the air inside the ping pong causing the air to expand and push the dent of the ping pong back out.

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If they float in water, then it is because the density of a ping pong ball is lighter than the density of water. The density of water is just below 1, and the density of a ping pong ball is much less than 1.

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Sure it can. But you'll need a lot a lot of ping pong balls- I believe the ratio is about 1 pound per 15 ping pong balls... then you can lift just about anything.

### What is the volume of one mole of ping pong balls?

Slice one ping pong ball in half. Fill up the half of the ping pong ball with water. Empty the water from the ping pong ball into a measuring cup. Measure the amount of water in mL and multiply it by 2, ( there are two halves ).

### How many ping-pong balls together weigh 1 pound when a ping-pong ball weighs 110 of an ounce?

There are 16 ounces in a pound, so 16 / 0.110 = 145.5 ping-pong balls would weigh 1 pound. Rounded down, this means that you would need 145 ping-pong balls to equal 1 pound in weight.

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A quick scrub with WARM soapy water should clean your balls just fine! ;-)

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balls of fury